Graphical user interface for a display screen



FIG. 1 is a front view of a graphical user interface for a display screen;

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof; and,

FIG. 4 is a front view of a fourth embodiment thereof.

The broken line showing of a display screen, text, elements, and the regions within some of the squares is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a graphical user interface for a display screen, as shown and described. 